Bottle neck adapter



FIG. 1 is a perspective view of my design;

FIG. 2 is an elevational view of my design;

FIG. 3 is a top plan view of my design; and,

FIG. 4 is a bottom plan view of my design.

The broken lines depict environmental structure which forms no part of the claimed design. 

I claim the ornamental design for a bottle neck adapter, as shown and described. 